This guide will take you through the steps required to upgrade the compact flash in a Cisco ASA 5505. This can be useful in a couple of scenarios. Firstly, you may like to take advantage of “bufferwrap” and store months of ASA logs in flash. Alternatively, you may be replacing damaged flash memory in the device.

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This is quite an interesting feature, and one that you wouldnt usually expect on a device like this.

Basically, when running IDS/IPS/Snort or any other packet sniffer in promiscuous mode, you need a way to “mirror” traffic from your hosts, to your IDS box. With Cisco switches, this is achieved through the use of the “monitor” commands, which set up Cisco SPAN ports (Switch Port Analyzer).

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This is a quick tip from  a colleague of mine who has spent a lot of his time in the network security industry knee deep in packet captures and the likes, this is a tip shouted across the room during a busy debugging session….

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Cisco shortcut Keys, familiar to the CCNA graduates among us and of course those dealing with Cisco kit regularly but probably if your like me some have been long since forgotten. Heres a reminder of how they work………

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Here is a quick and dirty tip for filtering through your running config on a Cisco router.

Type “sh run” and press enter

hit the / button  and the search term, for example “interface”. This will take you directly to the interfaces section of the config.

It has quite limited use but does come in handy at times